package socket;

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.charset.StandardCharsets;

/**
 * 3版本实现将消息发送给客户端
 *
 */
public class Server3 {
    private ServerSocket serverSocket;

    public Server3() {
        try {
            System.out.println("正在启动服务器");
            serverSocket = new ServerSocket(8088);
            System.out.println("服务器启动完毕！");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void start() {

        try {
            while (true) {
                System.out.println("等待客户端连接");
                Socket socket = serverSocket.accept();
                System.out.println("一个客户端连接上了");
                //启动一个线程负责与客户端交互
                Runnable handler = new ClientHandler(socket);
                Thread t = new Thread(handler);
                t.start();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        Server3 server = new Server3();
        server.start();
    }

    /*
    该线程负责与指定的客户端进行交互
     */
    private class ClientHandler implements Runnable {
        private String host;//记录客户端的IP地址
        private Socket socket;

        public ClientHandler(Socket socket) {
            this.socket = socket;
            host = socket.getInetAddress().getHostAddress();
        }

        @Override
        public void run() {
            try {
                InputStream in = socket.getInputStream();
                InputStreamReader isr = new InputStreamReader(in,StandardCharsets.UTF_8);
                BufferedReader br = new BufferedReader(isr);

                OutputStream out=socket.getOutputStream();
                OutputStreamWriter osw=new OutputStreamWriter(out, StandardCharsets.UTF_8);
                BufferedWriter bw=new BufferedWriter(osw);
                PrintWriter pw=new PrintWriter(bw,true);

                String message;
                while ((message = br.readLine()) != null) {
                    System.out.println(host+"说：" + message);
                    pw.println(host+"说：" + message);//将读取到的信息返回给客户端
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

}
